<template>
  <div>
    <span>获取验证码({{ time }}s)</span>
  </div>
</template>

<script setup lang="ts">
//引入组合式API函数ref
import { ref, watch } from "vue";
//倒计时的事件
let time = ref<number>(5);

//监听父组件传递过来props数据变化
watch(
  () => props.flag,
  () => {
    //开启定时器
    let timer = setInterval(() => {
      time.value--;
      if (time.value == 0) {
        //通知父组件倒计时模式结束
        $emit('getFlag',false);
        //清除定时器
        clearInterval(timer);
      }
    }, 1000);
  },
  {
    immediate: true,
  }
);

//接受父组件传递过来的props->flag:用于控制计数器组件显示与隐藏的
let props = defineProps(["flag"]);
let $emit = defineEmits(['getFlag']);
</script>

<style scoped></style>
